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Material: Plastic; Weight: 10.5 oz (298 g) / Weight: 7.5 x 4.7 inches (190 x 120 mm) / 7.5 x 4.7 inches (150 mm) / 5.9 inches (48 mm) / 1.9 inches (48 mm) / 1.9 inches (1 x CL2 mm) / Chlorine Ph. Manual x If the chlorine content is 1.5 PPM chlorinated solution in pool water for calibration 2. If the chlorine content is 1.5 PPM or cant find the calibration point 3. Use the traditional test strip 3. Use another pool water after the pool is adjusted to perform a different pool unless you change the measurement